Viscose Staple Fibre
Rayon staple fibre is defined by ISO standards as regenerated cellulose obtained by the viscose process. Chemically, staple fibre consists only of natural cellulose polymers, 11 – 13 % moisture, and a finishing agent, typically 0.5 – 1 % for textile operations.
Viscose staple fibre is spun continuously on spinning machines having spinnerettes dipped vertically into a circulating spinbath. The coagulated and regenerated viscose filaments are bundled together and collected by yarn guides onto godets. The viscose cable from these godets is collected further to form a tow. This tow passes through a stretching unit which generates a pre-defined stretch and thus influences the tensile properties of the tow/fibre. From the stretching unit the tow is guided through a cutting machine, where pre-defined lengths of staples are cut. These staples are flushed into a CS2 recovery trough for elimination of the physically bound CS2 and its recovery. Secondly, the bundles of staple fibre are opened for better accessibility of the following washing. The fibres are now led to the aftertreatment machine, where various deacidification, desulphurisation, bleaching and washing sequences are passed through. Finally, softeners are applied. The fibre is then led into dryer for a controlled dehumidification.
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